Linux iptables Pocket Reference
Gregor N. Purdy
Cyberspace in Peace and War, Second Edition
Martin C. Libicki
tmux (for Diego Cohen)
Brian P. Hogan
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert
Penetration Testing with Kali Linux OSCP
Offensive Security